<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>hello</title>
  <link rel="stylesheet" href="layout.css">
</head>
<body>
  设置块的颜色：
  <a href="#!/red">红色</a>
  <a href="#!/blue">蓝色</a>
  <a href="#!/yellow">黄色</a>
  <a href="#!/black">黑色</a>
  <a href="#!/orange">橙色</a>
  <div id="main"></div>
  <script src="//apps.bdimg.com/libs/jquery/2.1.4/jquery.min.js"></script>
  <script src="main.js"></script>
  </body>
</html>
